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TIL wasps are extremely valuable in horticulture since they prey upon almost every pest insect and are used as a natural form of pest control

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wLZw8 TIL of Jeanne de Clisson, a former noblewoman who became a privateer to avenge her husband after he was executed for treason by the French king. She plied the English Channel and targeted French ships, often slaughtering the crew, leaving few alive.
PYDLO TIL the USPS has a hotline (and email) for reporting fraud activities of its employees, which would include the postmaster general
GApkE TIL I learned about Bagel Bakers Local 338, a local trade union that was established in the early 1900s in New York City and whose craftsmen were the primary makers of New York's bagels, prepared by hand, until the advent of machine-made bagels in the 1960s led to its end.
grQM4 TIL that after seeing the prehistoric cave paintings at Lascaux, France, Picasso said, "We have learned nothing in twelve thousand years".
ADK6a TIL the plague that wiped out 50% of 14th Century Europe was never really eradicated. There is an average of 7 cases of plague every year in the US. The disease usually spreads through flea bites or by eating tainted meat. It usually hits the rural west of the US. (2:04)